"Erotiporn is the hybrid of erotica (love stories involving genitalia) and pornography (filth without character development or plot). Good erotiporn is like good pussy: tight, wet, and clean."
Read Phil Phantom's Golden Rules of Writing Erotiporn.
"Erotica authors, apply your skills, work your craft, use your words to the extent that the visual artist does."
For more, read Erotic Art: Words Vs Images